You won't need wdirdata nor wspddata unless you want to load those two large arrays and have a way to use them.
From the CU-plugin source file CU-plugin\WXtags-template-files\CUtags.txt file (which is the one Cumulus completes and FTPs to your webserver) delete those two lines if they are there. In the last version of this file they were not in the downloaded file set from Ken anyway.
There won't be a problem if they are there - you will just be uploading un-needed data.